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I'm having trouble with connectivity issues between a Dell computer and my optima ex530 projector. It has worked fine at times, other times it won't connect at all, other times it connects for 10-15 m

\015 I am having trouble with connectivity issues between a Dell computer and the Optoma ex530. It is used in a church for powerpoint presentations. Sometimes it works fine, other times we can't connect at all. Or it might connect, and then quit 10-15 minutes into the presentation. I suspect it's the computer, because the projector works flawlessly at home for any media presentations such as DVD, etc. Any answers?\015

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